High Quality Content by WIKIPEDIA articles! The Millennium Summit was a meeting among many world leaders lasting three days from 6 September to 8 September 2000 at the United Nations headquarters in New York City. Its purpose was to discuss the role of the United Nations at the turn of the 21st century. At this meeting, world leaders ratified the United Nations Millennium Declaration. This meeting was the largest gathering of world leaders in history as of the year 2000. It was followed by the World Summit five years later, which took place from 14 September to 16 September 2005.